I guess this is kind of a minor thing, but amongst the Oxyrhyncus papyri a fragment has been found with the earliest known documentary reference to a Christian in Egypt.  Documentary papyri are those with everyday interactions such as deeds of sale, letters to your uncle, local notices, and in this case a summons to court, etc.  In other words, they document daily life.  This fragment mentions an Egyptian who was called “Petosorapis, son of Horus, Christian” and is dated 256 CE.

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